Two packages provide the same file. This is usually due to mixing packages from different software sources.

Test Transaction Errors: file /usr/share/mysql/charsets/README from install of mysql-libs-5.1.55-1.fc14.i686 conflicts with file from package MySQL-server-5.5.9-1.rhel5.i386
file /usr/share/mysql/charsets/Index.xml from install of mysql-libs-5.1.55-1.fc14.i686 conflicts with file from package MySQL-server-5.5.9-1.rhel5.i386
file /usr/share/mysql/charsets/armscii8.xml from install of mysql-libs-5.1.55-1.fc14.i686 conflicts with file from package MySQL-server-5.5.9-1.rhel5.i386
file /usr/share/mysql/charsets/ascii.xml from install of mysql-libs-5.1.55-1.fc14.i686 conflicts with file from package MySQL-server-5.5.9-1.rhel5.i386
file /usr/share/mysql/charsets/cp1250.xml from install of mysql-libs-5.1.55-1.fc14.i686 conflicts with file from package MySQL-server-5.5.9-1.rhel5.i386
file /usr/share/mysql/charsets/cp1251.xml from install of mysql-libs-5.1.55-1.fc14.i686 conflicts with file from package MySQL-server-5.5.9-1.rhel5.i386
file /usr/share/mysql/charsets/cp1256.xml from install of mysql-libs-5....